diff --git a/source/libs/stream/src/streamBackendRocksdb.c b/source/libs/stream/src/streamBackendRocksdb.c
index f6439d7499..f34b7dc3cb 100644
--- a/source/libs/stream/src/streamBackendRocksdb.c
+++ b/source/libs/stream/src/streamBackendRocksdb.c
@@ -21,16 +21,15 @@
 #include "tref.h"
 
 typedef struct {
-  int8_t    init;
-  char*     pCurrent;
-  char*     pManifest;
-  SArray*   pSST;
-  int64_t   preCkptId;
-  int64_t   curChkpId;
-  SHashObj* pSSTable;
-  char*     path;
-  char*     buf;
-  int32_t   len;
+  int8_t  init;
+  char*   pCurrent;
+  char*   pManifest;
+  SArray* pSST;
+  int64_t preCkptId;
+  int64_t curChkpId;
+  char*   path;
+  char*   buf;
+  int32_t len;
 
   SHashObj* pSstTbl[2];
   SArray*   pAdd;
@@ -146,13 +145,12 @@ void    destroyFunc(void* arg);
 int32_t encodeValueFunc(void* value, int32_t vlen, int64_t ttl, char** dest);
 int32_t decodeValueFunc(void* value, int32_t vlen, int64_t* ttl, char** dest);
 
-SBackendManager* backendManagerCreate(char* path) {
+SBackendManager* bkdMgtCreate(char* path) {
   SBackendManager* p = taosMemoryCalloc(1, sizeof(SBackendManager));
   p->curChkpId = 0;
   p->preCkptId = 0;
   p->pSST = taosArrayInit(64, sizeof(void*));
   p->path = taosStrdup(path);
-  p->pSSTable = taosHashInit(64, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BINARY), false, HASH_ENTRY_LOCK);
   p->len = strlen(path) + 128;
   p->buf = taosMemoryCalloc(1, p->len);
 
@@ -165,14 +163,12 @@ SBackendManager* backendManagerCreate(char* path) {
   p->update = 0;
   return p;
 }
-void backendManagerDestroy(SBackendManager* bm) {
+void bkdMgtDestroy(SBackendManager* bm) {
   if (bm == NULL) return;
 
   taosMemoryFree(bm->buf);
   taosMemoryFree(bm->path);
 
-  taosHashCleanup(bm->pSSTable);
-
   taosArrayDestroyP(bm->pSST, taosMemoryFree);
   taosArrayDestroyP(bm->pAdd, taosMemoryFree);
   taosArrayDestroyP(bm->pDel, taosMemoryFree);
@@ -204,7 +200,7 @@ int32_t compareHashTable(SHashObj* p1, SHashObj* p2, SArray* add, SArray* del) {
 
   return code;
 }
-int32_t backendManagerGetDelta(SBackendManager* bm, int64_t chkpId, SArray* list) {
+int32_t bkdMgtGetDelta(SBackendManager* bm, int64_t chkpId, SArray* list) {
   const char* pCurrent = "CURRENT";
   int32_t     currLen = strlen(pCurrent);
 
@@ -259,8 +255,7 @@ int32_t backendManagerGetDelta(SBackendManager* bm, int64_t chkpId, SArray* list
       }
       pIter = taosHashIterate(bm->pSstTbl[1 - bm->idx], pIter);
     }
-    bm->update = 1;
-
+    if (taosArrayGetSize(bm->pAdd) > 0) bm->update = 1;
   } else {
     int32_t code = compareHashTable(bm->pSstTbl[bm->idx], bm->pSstTbl[1 - bm->idx], bm->pAdd, bm->pDel);
 
@@ -276,7 +271,7 @@ int32_t backendManagerGetDelta(SBackendManager* bm, int64_t chkpId, SArray* list
   return 0;
 }
 
-int32_t backendManagerDumpTo(SBackendManager* bm, char* dname) {
+int32_t bkdMgtDumpTo(SBackendManager* bm, char* dname) {
   int32_t code = 0;
   int32_t len = bm->len + 128;
 
@@ -340,7 +335,7 @@ int32_t backendManagerDumpTo(SBackendManager* bm, char* dname) {
   sprintf(dstBuf, "%s%s%s", dstDir, TD_DIRSEP, bm->pManifest);
   taosCopyFile(srcBuf, dstBuf);
 
-  // clear delta data
+  // clear delta data buf
   taosArrayClearP(bm->pAdd, taosMemoryFree);
   taosArrayClearP(bm->pDel, taosMemoryFree);